- Script
- E. Sotillos [Eugenio Sotillos ?]
- Pencils
- Huéscar
- Inks
- Huéscar
- Colors
- ? (sort/hvitt/orange)
- Letters
- typeset
- Genre
- detektiv-mysterium (detective-mystery)
- Characters
- Donald Preston; Fru Villers; Al Costello; Ricky Costello; Pablo; Maria; Tomas Penalara (flashback); Hernando Cortez (flashback); Professor Garcia